| File: | src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c |
| Warning: | line 837, column 7 Value stored to 'line_delta' is never read |
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| 1 | /* dwarf2dbg.c - DWARF2 debug support |
| 2 | Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 |
| 3 | Free Software Foundation, Inc. |
| 4 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com> |
| 5 | |
| 6 | This file is part of GAS, the GNU Assembler. |
| 7 | |
| 8 | GAS is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | GAS is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with GAS; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 21 | 02110-1301, USA. */ |
| 22 | |
| 23 | /* Logical line numbers can be controlled by the compiler via the |
| 24 | following directives: |
| 25 | |
| 26 | .file FILENO "file.c" |
| 27 | .loc FILENO LINENO [COLUMN] [basic_block] [prologue_end] \ |
| 28 | [epilogue_begin] [is_stmt VALUE] [isa VALUE] |
| 29 | */ |
| 30 | |
| 31 | #include "ansidecl.h" |
| 32 | #include "as.h" |
| 33 | #include "safe-ctype.h" |
| 34 | |
| 35 | #ifdef HAVE_LIMITS_H1 |
| 36 | #include <limits.h> |
| 37 | #else |
| 38 | #ifdef HAVE_SYS_PARAM_H1 |
| 39 | #include <sys/param.h> |
| 40 | #endif |
| 41 | #ifndef INT_MAX2147483647 |
| 42 | #define INT_MAX2147483647 (int) (((unsigned) (-1)) >> 1) |
| 43 | #endif |
| 44 | #endif |
| 45 | |
| 46 | #include "dwarf2dbg.h" |
| 47 | #include <filenames.h> |
| 48 | |
| 49 | #ifndef DWARF2_FORMAT |
| 50 | # define DWARF2_FORMAT()dwarf2_format_32bit dwarf2_format_32bit |
| 51 | #endif |
| 52 | |
| 53 | #ifndef DWARF2_ADDR_SIZE |
| 54 | # define DWARF2_ADDR_SIZE(bfd)(bfd_arch_bits_per_address (bfd) / 8) (bfd_arch_bits_per_address (bfd) / 8) |
| 55 | #endif |
| 56 | |
| 57 | #include "subsegs.h" |
| 58 | |
| 59 | #include "elf/dwarf2.h" |
| 60 | |
| 61 | /* Since we can't generate the prolog until the body is complete, we |
| 62 | use three different subsegments for .debug_line: one holding the |
| 63 | prolog, one for the directory and filename info, and one for the |
| 64 | body ("statement program"). */ |
| 65 | #define DL_PROLOG0 0 |
| 66 | #define DL_FILES1 1 |
| 67 | #define DL_BODY2 2 |
| 68 | |
| 69 | /* First special line opcde - leave room for the standard opcodes. |
| 70 | Note: If you want to change this, you'll have to update the |
| 71 | "standard_opcode_lengths" table that is emitted below in |
| 72 | out_debug_line(). */ |
| 73 | #define DWARF2_LINE_OPCODE_BASE13 13 |
| 74 | |
| 75 | #ifndef DWARF2_LINE_BASE-5 |
| 76 | /* Minimum line offset in a special line info. opcode. This value |
| 77 | was chosen to give a reasonable range of values. */ |
| 78 | # define DWARF2_LINE_BASE-5 -5 |
| 79 | #endif |
| 80 | |
| 81 | /* Range of line offsets in a special line info. opcode. */ |
| 82 | #ifndef DWARF2_LINE_RANGE14 |
| 83 | # define DWARF2_LINE_RANGE14 14 |
| 84 | #endif |
| 85 | |
| 86 | #ifndef DWARF2_LINE_MIN_INSN_LENGTH1 |
| 87 | /* Define the architecture-dependent minimum instruction length (in |
| 88 | bytes). This value should be rather too small than too big. */ |
| 89 | # define DWARF2_LINE_MIN_INSN_LENGTH1 1 |
| 90 | #endif |
| 91 | |
| 92 | /* Flag that indicates the initial value of the is_stmt_start flag. */ |
| 93 | #define DWARF2_LINE_DEFAULT_IS_STMT1 1 |
| 94 | |
| 95 | /* Given a special op, return the line skip amount. */ |
| 96 | #define SPECIAL_LINE(op)(((op) - 13)%14 + -5) \ |
| 97 | (((op) - DWARF2_LINE_OPCODE_BASE13)%DWARF2_LINE_RANGE14 + DWARF2_LINE_BASE-5) |
| 98 | |
| 99 | /* Given a special op, return the address skip amount (in units of |
| 100 | DWARF2_LINE_MIN_INSN_LENGTH. */ |
| 101 | #define SPECIAL_ADDR(op)(((op) - 13)/14) (((op) - DWARF2_LINE_OPCODE_BASE13)/DWARF2_LINE_RANGE14) |
| 102 | |
| 103 | /* The maximum address skip amount that can be encoded with a special op. */ |
| 104 | #define MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14) SPECIAL_ADDR(255)(((255) - 13)/14) |
| 105 | |
| 106 | struct line_entry { |
| 107 | struct line_entry *next; |
| 108 | symbolS *label; |
| 109 | struct dwarf2_line_info loc; |
| 110 | }; |
| 111 | |
| 112 | struct line_subseg { |
| 113 | struct line_subseg *next; |
| 114 | subsegT subseg; |
| 115 | struct line_entry *head; |
| 116 | struct line_entry **ptail; |
| 117 | }; |
| 118 | |
| 119 | struct line_seg { |
| 120 | struct line_seg *next; |
| 121 | segT seg; |
| 122 | struct line_subseg *head; |
| 123 | symbolS *text_start; |
| 124 | symbolS *text_end; |
| 125 | }; |
| 126 | |
| 127 | /* Collects data for all line table entries during assembly. */ |
| 128 | static struct line_seg *all_segs; |
| 129 | |
| 130 | struct file_entry { |
| 131 | const char *filename; |
| 132 | unsigned int dir; |
| 133 | }; |
| 134 | |
| 135 | /* Table of files used by .debug_line. */ |
| 136 | static struct file_entry *files; |
| 137 | static unsigned int files_in_use; |
| 138 | static unsigned int files_allocated; |
| 139 | |
| 140 | /* Table of directories used by .debug_line. */ |
| 141 | static char **dirs; |
| 142 | static unsigned int dirs_in_use; |
| 143 | static unsigned int dirs_allocated; |
| 144 | |
| 145 | /* TRUE when we've seen a .loc directive recently. Used to avoid |
| 146 | doing work when there's nothing to do. */ |
| 147 | static bfd_boolean loc_directive_seen; |
| 148 | |
| 149 | /* TRUE when we're supposed to set the basic block mark whenever a |
| 150 | label is seen. */ |
| 151 | bfd_boolean dwarf2_loc_mark_labels; |
| 152 | |
| 153 | /* Current location as indicated by the most recent .loc directive. */ |
| 154 | static struct dwarf2_line_info current = { |
| 155 | 1, 1, 0, 0, |
| 156 | DWARF2_LINE_DEFAULT_IS_STMT1 ? DWARF2_FLAG_IS_STMT(1 << 0) : 0 |
| 157 | }; |
| 158 | |
| 159 | /* The size of an address on the target. */ |
| 160 | static unsigned int sizeof_address; |
| 161 | |
| 162 | static struct line_subseg *get_line_subseg (segT, subsegT); |
| 163 | static unsigned int get_filenum (const char *, unsigned int); |
| 164 | static struct frag *first_frag_for_seg (segT); |
| 165 | static struct frag *last_frag_for_seg (segT); |
| 166 | static void out_byte (int); |
| 167 | static void out_opcode (int); |
| 168 | static void out_two (int); |
| 169 | static void out_four (int); |
| 170 | static void out_abbrev (int, int); |
| 171 | static void out_uleb128 (addressT); |
| 172 | static offsetT get_frag_fix (fragS *); |
| 173 | static void out_set_addr (symbolS *); |
| 174 | static int size_inc_line_addr (int, addressT); |
| 175 | static void emit_inc_line_addr (int, addressT, char *, int); |
| 176 | static void out_inc_line_addr (int, addressT); |
| 177 | static void relax_inc_line_addr (int, symbolS *, symbolS *); |
| 178 | static void process_entries (segT, struct line_entry *); |
| 179 | static void out_file_list (void); |
| 180 | static void out_debug_line (segT); |
| 181 | static void out_debug_aranges (segT, segT); |
| 182 | static void out_debug_abbrev (segT); |
| 183 | static void out_debug_info (segT, segT, segT); |
| 184 | |
| 185 | #ifndef TC_DWARF2_EMIT_OFFSETgeneric_dwarf2_emit_offset |
| 186 | # define TC_DWARF2_EMIT_OFFSETgeneric_dwarf2_emit_offset generic_dwarf2_emit_offset |
| 187 | static void generic_dwarf2_emit_offset (symbolS *, unsigned int); |
| 188 | |
| 189 | /* Create an offset to .dwarf2_*. */ |
| 190 | |
| 191 | static void |
| 192 | generic_dwarf2_emit_offset (symbolS *symbol, unsigned int size) |
| 193 | { |
| 194 | expressionS expr; |
| 195 | |
| 196 | expr.X_op = O_symbol; |
| 197 | expr.X_add_symbol = symbol; |
| 198 | expr.X_add_number = 0; |
| 199 | emit_expr (&expr, size); |
| 200 | } |
| 201 | #endif |
| 202 | |
| 203 | /* Find or create an entry for SEG+SUBSEG in ALL_SEGS. */ |
| 204 | |
| 205 | static struct line_subseg * |
| 206 | get_line_subseg (segT seg, subsegT subseg) |
| 207 | { |
| 208 | static segT last_seg; |
| 209 | static subsegT last_subseg; |
| 210 | static struct line_subseg *last_line_subseg; |
| 211 | |
| 212 | struct line_seg **ps, *s; |
| 213 | struct line_subseg **pss, *ss; |
| 214 | |
| 215 | if (seg == last_seg && subseg == last_subseg) |
| 216 | return last_line_subseg; |
| 217 | |
| 218 | for (ps = &all_segs; (s = *ps) != NULL((void*)0); ps = &s->next) |
| 219 | if (s->seg == seg) |
| 220 | goto found_seg; |
| 221 | |
| 222 | s = (struct line_seg *) xmalloc (sizeof (*s)); |
| 223 | s->next = NULL((void*)0); |
| 224 | s->seg = seg; |
| 225 | s->head = NULL((void*)0); |
| 226 | *ps = s; |
| 227 | |
| 228 | found_seg: |
| 229 | for (pss = &s->head; (ss = *pss) != NULL((void*)0) ; pss = &ss->next) |
| 230 | { |
| 231 | if (ss->subseg == subseg) |
| 232 | goto found_subseg; |
| 233 | if (ss->subseg > subseg) |
| 234 | break; |
| 235 | } |
| 236 | |
| 237 | ss = (struct line_subseg *) xmalloc (sizeof (*ss)); |
| 238 | ss->next = *pss; |
| 239 | ss->subseg = subseg; |
| 240 | ss->head = NULL((void*)0); |
| 241 | ss->ptail = &ss->head; |
| 242 | *pss = ss; |
| 243 | |
| 244 | found_subseg: |
| 245 | last_seg = seg; |
| 246 | last_subseg = subseg; |
| 247 | last_line_subseg = ss; |
| 248 | |
| 249 | return ss; |
| 250 | } |
| 251 | |
| 252 | /* Record an entry for LOC occurring at LABEL. */ |
| 253 | |
| 254 | static void |
| 255 | dwarf2_gen_line_info_1 (symbolS *label, struct dwarf2_line_info *loc) |
| 256 | { |
| 257 | struct line_subseg *ss; |
| 258 | struct line_entry *e; |
| 259 | |
| 260 | e = (struct line_entry *) xmalloc (sizeof (*e)); |
| 261 | e->next = NULL((void*)0); |
| 262 | e->label = label; |
| 263 | e->loc = *loc; |
| 264 | |
| 265 | ss = get_line_subseg (now_seg, now_subseg); |
| 266 | *ss->ptail = e; |
| 267 | ss->ptail = &e->next; |
| 268 | } |
| 269 | |
| 270 | /* Record an entry for LOC occurring at OFS within the current fragment. */ |
| 271 | |
| 272 | void |
| 273 | dwarf2_gen_line_info (addressT ofs, struct dwarf2_line_info *loc) |
| 274 | { |
| 275 | static unsigned int line = -1; |
| 276 | static unsigned int filenum = -1; |
| 277 | |
| 278 | symbolS *sym; |
| 279 | |
| 280 | /* Early out for as-yet incomplete location information. */ |
| 281 | if (loc->filenum == 0 || loc->line == 0) |
| 282 | return; |
| 283 | |
| 284 | /* Don't emit sequences of line symbols for the same line when the |
| 285 | symbols apply to assembler code. It is necessary to emit |
| 286 | duplicate line symbols when a compiler asks for them, because GDB |
| 287 | uses them to determine the end of the prologue. */ |
| 288 | if (debug_type == DEBUG_DWARF2 |
| 289 | && line == loc->line && filenum == loc->filenum) |
| 290 | return; |
| 291 | |
| 292 | line = loc->line; |
| 293 | filenum = loc->filenum; |
| 294 | |
| 295 | sym = symbol_temp_new (now_seg, ofs, frag_now); |
| 296 | dwarf2_gen_line_info_1 (sym, loc); |
| 297 | } |
| 298 | |
| 299 | /* Returns the current source information. If .file directives have |
| 300 | been encountered, the info for the corresponding source file is |
| 301 | returned. Otherwise, the info for the assembly source file is |
| 302 | returned. */ |
| 303 | |
| 304 | void |
| 305 | dwarf2_where (struct dwarf2_line_info *line) |
| 306 | { |
| 307 | if (debug_type == DEBUG_DWARF2) |
| 308 | { |
| 309 | char *filename; |
| 310 | as_where (&filename, &line->line); |
| 311 | line->filenum = get_filenum (filename, 0); |
| 312 | line->column = 0; |
| 313 | line->flags = DWARF2_FLAG_IS_STMT(1 << 0); |
| 314 | line->isa = current.isa; |
| 315 | } |
| 316 | else |
| 317 | *line = current; |
| 318 | } |
| 319 | |
| 320 | /* A hook to allow the target backend to inform the line number state |
| 321 | machine of isa changes when assembler debug info is enabled. */ |
| 322 | |
| 323 | void |
| 324 | dwarf2_set_isa (unsigned int isa) |
| 325 | { |
| 326 | current.isa = isa; |
| 327 | } |
| 328 | |
| 329 | /* Called for each machine instruction, or relatively atomic group of |
| 330 | machine instructions (ie built-in macro). The instruction or group |
| 331 | is SIZE bytes in length. If dwarf2 line number generation is called |
| 332 | for, emit a line statement appropriately. */ |
| 333 | |
| 334 | void |
| 335 | dwarf2_emit_insn (int size) |
| 336 | { |
| 337 | struct dwarf2_line_info loc; |
| 338 | |
| 339 | if (loc_directive_seen) |
| 340 | { |
| 341 | /* Use the last location established by a .loc directive, not |
| 342 | the value returned by dwarf2_where(). That calls as_where() |
| 343 | which will return either the logical input file name (foo.c) |
| 344 | or the physical input file name (foo.s) and not the file name |
| 345 | specified in the most recent .loc directive (eg foo.h). */ |
| 346 | loc = current; |
| 347 | |
| 348 | /* Unless we generate DWARF2 debugging information for each |
| 349 | assembler line, we only emit one line symbol for one LOC. */ |
| 350 | if (debug_type != DEBUG_DWARF2) |
| 351 | loc_directive_seen = FALSE0; |
| 352 | } |
| 353 | else if (debug_type != DEBUG_DWARF2) |
| 354 | return; |
| 355 | else |
| 356 | dwarf2_where (&loc); |
| 357 | |
| 358 | dwarf2_gen_line_info (frag_now_fix () - size, &loc); |
| 359 | |
| 360 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK(1 << 1) |
| 361 | | DWARF2_FLAG_PROLOGUE_END(1 << 2) |
| 362 | | DWARF2_FLAG_EPILOGUE_BEGIN(1 << 3)); |
| 363 | } |
| 364 | |
| 365 | /* Called for each (preferably code) label. If dwarf2_loc_mark_labels |
| 366 | is enabled, emit a basic block marker. */ |
| 367 | |
| 368 | void |
| 369 | dwarf2_emit_label (symbolS *label) |
| 370 | { |
| 371 | struct dwarf2_line_info loc; |
| 372 | |
| 373 | if (!dwarf2_loc_mark_labels) |
| 374 | return; |
| 375 | if (S_GET_SEGMENT (label) != now_seg) |
| 376 | return; |
| 377 | if (!(bfd_get_section_flags (stdoutput, now_seg)((now_seg)->flags + 0) & SEC_CODE0x010)) |
| 378 | return; |
| 379 | |
| 380 | if (debug_type == DEBUG_DWARF2) |
| 381 | dwarf2_where (&loc); |
| 382 | else |
| 383 | { |
| 384 | loc = current; |
| 385 | loc_directive_seen = FALSE0; |
| 386 | } |
| 387 | |
| 388 | loc.flags |= DWARF2_FLAG_BASIC_BLOCK(1 << 1); |
| 389 | |
| 390 | current.flags &= ~(DWARF2_FLAG_BASIC_BLOCK(1 << 1) |
| 391 | | DWARF2_FLAG_PROLOGUE_END(1 << 2) |
| 392 | | DWARF2_FLAG_EPILOGUE_BEGIN(1 << 3)); |
| 393 | |
| 394 | dwarf2_gen_line_info_1 (label, &loc); |
| 395 | } |
| 396 | |
| 397 | /* Get a .debug_line file number for FILENAME. If NUM is nonzero, |
| 398 | allocate it on that file table slot, otherwise return the first |
| 399 | empty one. */ |
| 400 | |
| 401 | static unsigned int |
| 402 | get_filenum (const char *filename, unsigned int num) |
| 403 | { |
| 404 | static unsigned int last_used, last_used_dir_len; |
| 405 | const char *file; |
| 406 | size_t dir_len; |
| 407 | unsigned int i, dir; |
| 408 | |
| 409 | if (num == 0 && last_used) |
| 410 | { |
| 411 | if (! files[last_used].dir |
| 412 | && strcmp (filename, files[last_used].filename) == 0) |
| 413 | return last_used; |
| 414 | if (files[last_used].dir |
| 415 | && strncmp (filename, dirs[files[last_used].dir], |
| 416 | last_used_dir_len) == 0 |
| 417 | && IS_DIR_SEPARATOR (filename [last_used_dir_len])((filename [last_used_dir_len]) == '/') |
| 418 | && strcmp (filename + last_used_dir_len + 1, |
| 419 | files[last_used].filename) == 0) |
| 420 | return last_used; |
| 421 | } |
| 422 | |
| 423 | file = lbasename (filename); |
| 424 | /* Don't make empty string from / or A: from A:/ . */ |
| 425 | #ifdef HAVE_DOS_BASED_FILE_SYSTEM |
| 426 | if (file <= filename + 3) |
| 427 | file = filename; |
| 428 | #else |
| 429 | if (file == filename + 1) |
| 430 | file = filename; |
| 431 | #endif |
| 432 | dir_len = file - filename; |
| 433 | |
| 434 | dir = 0; |
| 435 | if (dir_len) |
| 436 | { |
| 437 | --dir_len; |
| 438 | for (dir = 1; dir < dirs_in_use; ++dir) |
| 439 | if (strncmp (filename, dirs[dir], dir_len) == 0 |
| 440 | && dirs[dir][dir_len] == '\0') |
| 441 | break; |
| 442 | |
| 443 | if (dir >= dirs_in_use) |
| 444 | { |
| 445 | if (dir >= dirs_allocated) |
| 446 | { |
| 447 | dirs_allocated = dir + 32; |
| 448 | dirs = (char **) |
| 449 | xrealloc (dirs, (dir + 32) * sizeof (const char *)); |
| 450 | } |
| 451 | |
| 452 | dirs[dir] = xmalloc (dir_len + 1); |
| 453 | memcpy (dirs[dir], filename, dir_len); |
| 454 | dirs[dir][dir_len] = '\0'; |
| 455 | dirs_in_use = dir + 1; |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | if (num == 0) |
| 460 | { |
| 461 | for (i = 1; i < files_in_use; ++i) |
| 462 | if (files[i].dir == dir |
| 463 | && files[i].filename |
| 464 | && strcmp (file, files[i].filename) == 0) |
| 465 | { |
| 466 | last_used = i; |
| 467 | last_used_dir_len = dir_len; |
| 468 | return i; |
| 469 | } |
| 470 | } |
| 471 | else |
| 472 | i = num; |
| 473 | |
| 474 | if (i >= files_allocated) |
| 475 | { |
| 476 | unsigned int old = files_allocated; |
| 477 | |
| 478 | files_allocated = i + 32; |
| 479 | files = (struct file_entry *) |
| 480 | xrealloc (files, (i + 32) * sizeof (struct file_entry)); |
| 481 | |
| 482 | memset (files + old, 0, (i + 32 - old) * sizeof (struct file_entry)); |
| 483 | } |
| 484 | |
| 485 | files[i].filename = num ? file : xstrdup (file); |
| 486 | files[i].dir = dir; |
| 487 | if (files_in_use < i + 1) |
| 488 | files_in_use = i + 1; |
| 489 | last_used = i; |
| 490 | last_used_dir_len = dir_len; |
| 491 | |
| 492 | return i; |
| 493 | } |
| 494 | |
| 495 | /* Handle two forms of .file directive: |
| 496 | - Pass .file "source.c" to s_app_file |
| 497 | - Handle .file 1 "source.c" by adding an entry to the DWARF-2 file table |
| 498 | |
| 499 | If an entry is added to the file table, return a pointer to the filename. */ |
| 500 | |
| 501 | char * |
| 502 | dwarf2_directive_file (int dummy ATTRIBUTE_UNUSED__attribute__ ((__unused__))) |
| 503 | { |
| 504 | offsetT num; |
| 505 | char *filename; |
| 506 | int filename_len; |
| 507 | |
| 508 | /* Continue to accept a bare string and pass it off. */ |
| 509 | SKIP_WHITESPACE ()((*input_line_pointer == ' ') ? ++input_line_pointer : 0); |
| 510 | if (*input_line_pointer == '"') |
| 511 | { |
| 512 | s_app_file (0); |
| 513 | return NULL((void*)0); |
| 514 | } |
| 515 | |
| 516 | num = get_absolute_expression (); |
| 517 | filename = demand_copy_C_string (&filename_len); |
| 518 | if (filename == NULL((void*)0)) |
| 519 | return NULL((void*)0); |
| 520 | demand_empty_rest_of_line (); |
| 521 | |
| 522 | if (num < 1) |
| 523 | { |
| 524 | as_bad (_("file number less than one")("file number less than one")); |
| 525 | return NULL((void*)0); |
| 526 | } |
| 527 | |
| 528 | if (num < (int) files_in_use && files[num].filename != 0) |
| 529 | { |
| 530 | as_bad (_("file number %ld already allocated")("file number %ld already allocated"), (long) num); |
| 531 | return NULL((void*)0); |
| 532 | } |
| 533 | |
| 534 | get_filenum (filename, num); |
| 535 | |
| 536 | return filename; |
| 537 | } |
| 538 | |
| 539 | void |
| 540 | dwarf2_directive_loc (int dummy ATTRIBUTE_UNUSED__attribute__ ((__unused__))) |
| 541 | { |
| 542 | offsetT filenum, line; |
| 543 | |
| 544 | filenum = get_absolute_expression (); |
| 545 | SKIP_WHITESPACE ()((*input_line_pointer == ' ') ? ++input_line_pointer : 0); |
| 546 | line = get_absolute_expression (); |
| 547 | |
| 548 | if (filenum < 1) |
| 549 | { |
| 550 | as_bad (_("file number less than one")("file number less than one")); |
| 551 | return; |
| 552 | } |
| 553 | if (filenum >= (int) files_in_use || files[filenum].filename == 0) |
| 554 | { |
| 555 | as_bad (_("unassigned file number %ld")("unassigned file number %ld"), (long) filenum); |
| 556 | return; |
| 557 | } |
| 558 | |
| 559 | current.filenum = filenum; |
| 560 | current.line = line; |
| 561 | |
| 562 | #ifndef NO_LISTING |
| 563 | if (listing) |
| 564 | { |
| 565 | if (files[filenum].dir) |
| 566 | { |
| 567 | size_t dir_len = strlen (dirs[files[filenum].dir]); |
| 568 | size_t file_len = strlen (files[filenum].filename); |
| 569 | char *cp = (char *) alloca (dir_len + 1 + file_len + 1)__builtin_alloca(dir_len + 1 + file_len + 1); |
| 570 | |
| 571 | memcpy (cp, dirs[files[filenum].dir], dir_len); |
| 572 | cp[dir_len] = '/'; |
| 573 | memcpy (cp + dir_len + 1, files[filenum].filename, file_len); |
| 574 | cp[dir_len + file_len + 1] = '\0'; |
| 575 | listing_source_file (cp); |
| 576 | } |
| 577 | else |
| 578 | listing_source_file (files[filenum].filename); |
| 579 | listing_source_line (line); |
| 580 | } |
| 581 | #endif |
| 582 | |
| 583 | SKIP_WHITESPACE ()((*input_line_pointer == ' ') ? ++input_line_pointer : 0); |
| 584 | if (ISDIGIT (*input_line_pointer)(_sch_istable[(*input_line_pointer) & 0xff] & (unsigned short)(_sch_isdigit))) |
| 585 | { |
| 586 | current.column = get_absolute_expression (); |
| 587 | SKIP_WHITESPACE ()((*input_line_pointer == ' ') ? ++input_line_pointer : 0); |
| 588 | } |
| 589 | |
| 590 | while (ISALPHA (*input_line_pointer)(_sch_istable[(*input_line_pointer) & 0xff] & (unsigned short)(_sch_isalpha))) |
| 591 | { |
| 592 | char *p, c; |
| 593 | offsetT value; |
| 594 | |
| 595 | p = input_line_pointer; |
| 596 | c = get_symbol_end (); |
| 597 | |
| 598 | if (strcmp (p, "basic_block") == 0) |
| 599 | { |
| 600 | current.flags |= DWARF2_FLAG_BASIC_BLOCK(1 << 1); |
| 601 | *input_line_pointer = c; |
| 602 | } |
| 603 | else if (strcmp (p, "prologue_end") == 0) |
| 604 | { |
| 605 | current.flags |= DWARF2_FLAG_PROLOGUE_END(1 << 2); |
| 606 | *input_line_pointer = c; |
| 607 | } |
| 608 | else if (strcmp (p, "epilogue_begin") == 0) |
| 609 | { |
| 610 | current.flags |= DWARF2_FLAG_EPILOGUE_BEGIN(1 << 3); |
| 611 | *input_line_pointer = c; |
| 612 | } |
| 613 | else if (strcmp (p, "is_stmt") == 0) |
| 614 | { |
| 615 | *input_line_pointer = c; |
| 616 | value = get_absolute_expression (); |
| 617 | if (value == 0) |
| 618 | current.flags &= ~DWARF2_FLAG_IS_STMT(1 << 0); |
| 619 | else if (value == 1) |
| 620 | current.flags |= DWARF2_FLAG_IS_STMT(1 << 0); |
| 621 | else |
| 622 | { |
| 623 | as_bad (_("is_stmt value not 0 or 1")("is_stmt value not 0 or 1")); |
| 624 | return; |
| 625 | } |
| 626 | } |
| 627 | else if (strcmp (p, "isa") == 0) |
| 628 | { |
| 629 | *input_line_pointer = c; |
| 630 | value = get_absolute_expression (); |
| 631 | if (value >= 0) |
| 632 | current.isa = value; |
| 633 | else |
| 634 | { |
| 635 | as_bad (_("isa number less than zero")("isa number less than zero")); |
| 636 | return; |
| 637 | } |
| 638 | } |
| 639 | else |
| 640 | { |
| 641 | as_bad (_("unknown .loc sub-directive `%s'")("unknown .loc sub-directive `%s'"), p); |
| 642 | *input_line_pointer = c; |
| 643 | return; |
| 644 | } |
| 645 | |
| 646 | SKIP_WHITESPACE ()((*input_line_pointer == ' ') ? ++input_line_pointer : 0); |
| 647 | } |
| 648 | |
| 649 | demand_empty_rest_of_line (); |
| 650 | loc_directive_seen = TRUE1; |
| 651 | } |
| 652 | |
| 653 | void |
| 654 | dwarf2_directive_loc_mark_labels (int dummy ATTRIBUTE_UNUSED__attribute__ ((__unused__))) |
| 655 | { |
| 656 | offsetT value = get_absolute_expression (); |
| 657 | |
| 658 | if (value != 0 && value != 1) |
| 659 | { |
| 660 | as_bad (_("expected 0 or 1")("expected 0 or 1")); |
| 661 | ignore_rest_of_line (); |
| 662 | } |
| 663 | else |
| 664 | { |
| 665 | dwarf2_loc_mark_labels = value != 0; |
| 666 | demand_empty_rest_of_line (); |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | static struct frag * |
| 671 | first_frag_for_seg (segT seg) |
| 672 | { |
| 673 | frchainS *f, *first = NULL((void*)0); |
| 674 | |
| 675 | for (f = frchain_root; f; f = f->frch_next) |
| 676 | if (f->frch_seg == seg |
| 677 | && (! first || first->frch_subseg > f->frch_subseg)) |
| 678 | first = f; |
| 679 | |
| 680 | return first ? first->frch_root : NULL((void*)0); |
| 681 | } |
| 682 | |
| 683 | static struct frag * |
| 684 | last_frag_for_seg (segT seg) |
| 685 | { |
| 686 | frchainS *f, *last = NULL((void*)0); |
| 687 | |
| 688 | for (f = frchain_root; f; f = f->frch_next) |
| 689 | if (f->frch_seg == seg |
| 690 | && (! last || last->frch_subseg < f->frch_subseg)) |
| 691 | last= f; |
| 692 | |
| 693 | return last ? last->frch_last : NULL((void*)0); |
| 694 | } |
| 695 | |
| 696 | /* Emit a single byte into the current segment. */ |
| 697 | |
| 698 | static inline void |
| 699 | out_byte (int byte) |
| 700 | { |
| 701 | FRAG_APPEND_1_CHAR (byte)frag_append_1_char (byte); |
| 702 | } |
| 703 | |
| 704 | /* Emit a statement program opcode into the current segment. */ |
| 705 | |
| 706 | static inline void |
| 707 | out_opcode (int opc) |
| 708 | { |
| 709 | out_byte (opc); |
| 710 | } |
| 711 | |
| 712 | /* Emit a two-byte word into the current segment. */ |
| 713 | |
| 714 | static inline void |
| 715 | out_two (int data) |
| 716 | { |
| 717 | md_number_to_charsnumber_to_chars_littleendian (frag_more (2), data, 2); |
| 718 | } |
| 719 | |
| 720 | /* Emit a four byte word into the current segment. */ |
| 721 | |
| 722 | static inline void |
| 723 | out_four (int data) |
| 724 | { |
| 725 | md_number_to_charsnumber_to_chars_littleendian (frag_more (4), data, 4); |
| 726 | } |
| 727 | |
| 728 | /* Emit an unsigned "little-endian base 128" number. */ |
| 729 | |
| 730 | static void |
| 731 | out_uleb128 (addressT value) |
| 732 | { |
| 733 | output_leb128 (frag_more (sizeof_leb128 (value, 0)), value, 0); |
| 734 | } |
| 735 | |
| 736 | /* Emit a tuple for .debug_abbrev. */ |
| 737 | |
| 738 | static inline void |
| 739 | out_abbrev (int name, int form) |
| 740 | { |
| 741 | out_uleb128 (name); |
| 742 | out_uleb128 (form); |
| 743 | } |
| 744 | |
| 745 | /* Get the size of a fragment. */ |
| 746 | |
| 747 | static offsetT |
| 748 | get_frag_fix (fragS *frag) |
| 749 | { |
| 750 | frchainS *fr; |
| 751 | |
| 752 | if (frag->fr_next) |
| 753 | return frag->fr_fix; |
| 754 | |
| 755 | /* If a fragment is the last in the chain, special measures must be |
| 756 | taken to find its size before relaxation, since it may be pending |
| 757 | on some subsegment chain. */ |
| 758 | for (fr = frchain_root; fr; fr = fr->frch_next) |
| 759 | if (fr->frch_last == frag) |
| 760 | return (char *) obstack_next_free (&fr->frch_obstack)((&fr->frch_obstack)->next_free) - frag->fr_literal; |
| 761 | |
| 762 | abort ()as_abort ("/usr/src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c" , 762, __PRETTY_FUNCTION__); |
| 763 | } |
| 764 | |
| 765 | /* Set an absolute address (may result in a relocation entry). */ |
| 766 | |
| 767 | static void |
| 768 | out_set_addr (symbolS *sym) |
| 769 | { |
| 770 | expressionS expr; |
| 771 | |
| 772 | out_opcode (DW_LNS_extended_op); |
| 773 | out_uleb128 (sizeof_address + 1); |
| 774 | |
| 775 | out_opcode (DW_LNE_set_address); |
| 776 | expr.X_op = O_symbol; |
| 777 | expr.X_add_symbol = sym; |
| 778 | expr.X_add_number = 0; |
| 779 | emit_expr (&expr, sizeof_address); |
| 780 | } |
| 781 | |
| 782 | #if DWARF2_LINE_MIN_INSN_LENGTH1 > 1 |
| 783 | static void scale_addr_delta (addressT *); |
| 784 | |
| 785 | static void |
| 786 | scale_addr_delta (addressT *addr_delta) |
| 787 | { |
| 788 | static int printed_this = 0; |
| 789 | if (*addr_delta % DWARF2_LINE_MIN_INSN_LENGTH1 != 0) |
| 790 | { |
| 791 | if (!printed_this) |
| 792 | as_bad("unaligned opcodes detected in executable segment"); |
| 793 | printed_this = 1; |
| 794 | } |
| 795 | *addr_delta /= DWARF2_LINE_MIN_INSN_LENGTH1; |
| 796 | } |
| 797 | #else |
| 798 | #define scale_addr_delta(A) |
| 799 | #endif |
| 800 | |
| 801 | /* Encode a pair of line and address skips as efficiently as possible. |
| 802 | Note that the line skip is signed, whereas the address skip is unsigned. |
| 803 | |
| 804 | The following two routines *must* be kept in sync. This is |
| 805 | enforced by making emit_inc_line_addr abort if we do not emit |
| 806 | exactly the expected number of bytes. */ |
| 807 | |
| 808 | static int |
| 809 | size_inc_line_addr (int line_delta, addressT addr_delta) |
| 810 | { |
| 811 | unsigned int tmp, opcode; |
| 812 | int len = 0; |
| 813 | |
| 814 | /* Scale the address delta by the minimum instruction length. */ |
| 815 | scale_addr_delta (&addr_delta); |
| 816 | |
| 817 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
| 818 | We cannot use special opcodes here, since we want the end_sequence |
| 819 | to emit the matrix entry. */ |
| 820 | if (line_delta == INT_MAX2147483647) |
| 821 | { |
| 822 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14)) |
| 823 | len = 1; |
| 824 | else |
| 825 | len = 1 + sizeof_leb128 (addr_delta, 0); |
| 826 | return len + 3; |
| 827 | } |
| 828 | |
| 829 | /* Bias the line delta by the base. */ |
| 830 | tmp = line_delta - DWARF2_LINE_BASE-5; |
| 831 | |
| 832 | /* If the line increment is out of range of a special opcode, we |
| 833 | must encode it with DW_LNS_advance_line. */ |
| 834 | if (tmp >= DWARF2_LINE_RANGE14) |
| 835 | { |
| 836 | len = 1 + sizeof_leb128 (line_delta, 1); |
| 837 | line_delta = 0; |
Value stored to 'line_delta' is never read | |
| 838 | tmp = 0 - DWARF2_LINE_BASE-5; |
| 839 | } |
| 840 | |
| 841 | /* Bias the opcode by the special opcode base. */ |
| 842 | tmp += DWARF2_LINE_OPCODE_BASE13; |
| 843 | |
| 844 | /* Avoid overflow when addr_delta is large. */ |
| 845 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14)) |
| 846 | { |
| 847 | /* Try using a special opcode. */ |
| 848 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE14; |
| 849 | if (opcode <= 255) |
| 850 | return len + 1; |
| 851 | |
| 852 | /* Try using DW_LNS_const_add_pc followed by special op. */ |
| 853 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14)) * DWARF2_LINE_RANGE14; |
| 854 | if (opcode <= 255) |
| 855 | return len + 2; |
| 856 | } |
| 857 | |
| 858 | /* Otherwise use DW_LNS_advance_pc. */ |
| 859 | len += 1 + sizeof_leb128 (addr_delta, 0); |
| 860 | |
| 861 | /* DW_LNS_copy or special opcode. */ |
| 862 | len += 1; |
| 863 | |
| 864 | return len; |
| 865 | } |
| 866 | |
| 867 | static void |
| 868 | emit_inc_line_addr (int line_delta, addressT addr_delta, char *p, int len) |
| 869 | { |
| 870 | unsigned int tmp, opcode; |
| 871 | int need_copy = 0; |
| 872 | char *end = p + len; |
| 873 | |
| 874 | /* Line number sequences cannot go backward in addresses. This means |
| 875 | we've incorrectly ordered the statements in the sequence. */ |
| 876 | assert ((offsetT) addr_delta >= 0)((void) (((offsetT) addr_delta >= 0) ? 0 : (as_assert ("/usr/src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c" , 876, __PRETTY_FUNCTION__), 0))); |
| 877 | |
| 878 | /* Scale the address delta by the minimum instruction length. */ |
| 879 | scale_addr_delta (&addr_delta); |
| 880 | |
| 881 | /* INT_MAX is a signal that this is actually a DW_LNE_end_sequence. |
| 882 | We cannot use special opcodes here, since we want the end_sequence |
| 883 | to emit the matrix entry. */ |
| 884 | if (line_delta == INT_MAX2147483647) |
| 885 | { |
| 886 | if (addr_delta == MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14)) |
| 887 | *p++ = DW_LNS_const_add_pc; |
| 888 | else |
| 889 | { |
| 890 | *p++ = DW_LNS_advance_pc; |
| 891 | p += output_leb128 (p, addr_delta, 0); |
| 892 | } |
| 893 | |
| 894 | *p++ = DW_LNS_extended_op; |
| 895 | *p++ = 1; |
| 896 | *p++ = DW_LNE_end_sequence; |
| 897 | goto done; |
| 898 | } |
| 899 | |
| 900 | /* Bias the line delta by the base. */ |
| 901 | tmp = line_delta - DWARF2_LINE_BASE-5; |
| 902 | |
| 903 | /* If the line increment is out of range of a special opcode, we |
| 904 | must encode it with DW_LNS_advance_line. */ |
| 905 | if (tmp >= DWARF2_LINE_RANGE14) |
| 906 | { |
| 907 | *p++ = DW_LNS_advance_line; |
| 908 | p += output_leb128 (p, line_delta, 1); |
| 909 | |
| 910 | line_delta = 0; |
| 911 | tmp = 0 - DWARF2_LINE_BASE-5; |
| 912 | need_copy = 1; |
| 913 | } |
| 914 | |
| 915 | /* Prettier, I think, to use DW_LNS_copy instead of a "line +0, addr +0" |
| 916 | special opcode. */ |
| 917 | if (line_delta == 0 && addr_delta == 0) |
| 918 | { |
| 919 | *p++ = DW_LNS_copy; |
| 920 | goto done; |
| 921 | } |
| 922 | |
| 923 | /* Bias the opcode by the special opcode base. */ |
| 924 | tmp += DWARF2_LINE_OPCODE_BASE13; |
| 925 | |
| 926 | /* Avoid overflow when addr_delta is large. */ |
| 927 | if (addr_delta < 256 + MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14)) |
| 928 | { |
| 929 | /* Try using a special opcode. */ |
| 930 | opcode = tmp + addr_delta * DWARF2_LINE_RANGE14; |
| 931 | if (opcode <= 255) |
| 932 | { |
| 933 | *p++ = opcode; |
| 934 | goto done; |
| 935 | } |
| 936 | |
| 937 | /* Try using DW_LNS_const_add_pc followed by special op. */ |
| 938 | opcode = tmp + (addr_delta - MAX_SPECIAL_ADDR_DELTA(((255) - 13)/14)) * DWARF2_LINE_RANGE14; |
| 939 | if (opcode <= 255) |
| 940 | { |
| 941 | *p++ = DW_LNS_const_add_pc; |
| 942 | *p++ = opcode; |
| 943 | goto done; |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | /* Otherwise use DW_LNS_advance_pc. */ |
| 948 | *p++ = DW_LNS_advance_pc; |
| 949 | p += output_leb128 (p, addr_delta, 0); |
| 950 | |
| 951 | if (need_copy) |
| 952 | *p++ = DW_LNS_copy; |
| 953 | else |
| 954 | *p++ = tmp; |
| 955 | |
| 956 | done: |
| 957 | assert (p == end)((void) ((p == end) ? 0 : (as_assert ("/usr/src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c" , 957, __PRETTY_FUNCTION__), 0))); |
| 958 | } |
| 959 | |
| 960 | /* Handy routine to combine calls to the above two routines. */ |
| 961 | |
| 962 | static void |
| 963 | out_inc_line_addr (int line_delta, addressT addr_delta) |
| 964 | { |
| 965 | int len = size_inc_line_addr (line_delta, addr_delta); |
| 966 | emit_inc_line_addr (line_delta, addr_delta, frag_more (len), len); |
| 967 | } |
| 968 | |
| 969 | /* Generate a variant frag that we can use to relax address/line |
| 970 | increments between fragments of the target segment. */ |
| 971 | |
| 972 | static void |
| 973 | relax_inc_line_addr (int line_delta, symbolS *to_sym, symbolS *from_sym) |
| 974 | { |
| 975 | expressionS expr; |
| 976 | int max_chars; |
| 977 | |
| 978 | expr.X_op = O_subtract; |
| 979 | expr.X_add_symbol = to_sym; |
| 980 | expr.X_op_symbol = from_sym; |
| 981 | expr.X_add_number = 0; |
| 982 | |
| 983 | /* The maximum size of the frag is the line delta with a maximum |
| 984 | sized address delta. */ |
| 985 | max_chars = size_inc_line_addr (line_delta, -DWARF2_LINE_MIN_INSN_LENGTH1); |
| 986 | |
| 987 | frag_var (rs_dwarf2dbg, max_chars, max_chars, 1, |
| 988 | make_expr_symbol (&expr), line_delta, NULL((void*)0)); |
| 989 | } |
| 990 | |
| 991 | /* The function estimates the size of a rs_dwarf2dbg variant frag |
| 992 | based on the current values of the symbols. It is called before |
| 993 | the relaxation loop. We set fr_subtype to the expected length. */ |
| 994 | |
| 995 | int |
| 996 | dwarf2dbg_estimate_size_before_relax (fragS *frag) |
| 997 | { |
| 998 | offsetT addr_delta; |
| 999 | int size; |
| 1000 | |
| 1001 | addr_delta = resolve_symbol_value (frag->fr_symbol); |
| 1002 | size = size_inc_line_addr (frag->fr_offset, addr_delta); |
| 1003 | |
| 1004 | frag->fr_subtype = size; |
| 1005 | |
| 1006 | return size; |
| 1007 | } |
| 1008 | |
| 1009 | /* This function relaxes a rs_dwarf2dbg variant frag based on the |
| 1010 | current values of the symbols. fr_subtype is the current length |
| 1011 | of the frag. This returns the change in frag length. */ |
| 1012 | |
| 1013 | int |
| 1014 | dwarf2dbg_relax_frag (fragS *frag) |
| 1015 | { |
| 1016 | int old_size, new_size; |
| 1017 | |
| 1018 | old_size = frag->fr_subtype; |
| 1019 | new_size = dwarf2dbg_estimate_size_before_relax (frag); |
| 1020 | |
| 1021 | return new_size - old_size; |
| 1022 | } |
| 1023 | |
| 1024 | /* This function converts a rs_dwarf2dbg variant frag into a normal |
| 1025 | fill frag. This is called after all relaxation has been done. |
| 1026 | fr_subtype will be the desired length of the frag. */ |
| 1027 | |
| 1028 | void |
| 1029 | dwarf2dbg_convert_frag (fragS *frag) |
| 1030 | { |
| 1031 | offsetT addr_diff; |
| 1032 | |
| 1033 | addr_diff = resolve_symbol_value (frag->fr_symbol); |
| 1034 | |
| 1035 | /* fr_var carries the max_chars that we created the fragment with. |
| 1036 | fr_subtype carries the current expected length. We must, of |
| 1037 | course, have allocated enough memory earlier. */ |
| 1038 | assert (frag->fr_var >= (int) frag->fr_subtype)((void) ((frag->fr_var >= (int) frag->fr_subtype) ? 0 : (as_assert ("/usr/src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c" , 1038, __PRETTY_FUNCTION__), 0))); |
| 1039 | |
| 1040 | emit_inc_line_addr (frag->fr_offset, addr_diff, |
| 1041 | frag->fr_literal + frag->fr_fix, frag->fr_subtype); |
| 1042 | |
| 1043 | frag->fr_fix += frag->fr_subtype; |
| 1044 | frag->fr_type = rs_fill; |
| 1045 | frag->fr_var = 0; |
| 1046 | frag->fr_offset = 0; |
| 1047 | } |
| 1048 | |
| 1049 | /* Generate .debug_line content for the chain of line number entries |
| 1050 | beginning at E, for segment SEG. */ |
| 1051 | |
| 1052 | static void |
| 1053 | process_entries (segT seg, struct line_entry *e) |
| 1054 | { |
| 1055 | unsigned filenum = 1; |
| 1056 | unsigned line = 1; |
| 1057 | unsigned column = 0; |
| 1058 | unsigned isa = 0; |
| 1059 | unsigned flags = DWARF2_LINE_DEFAULT_IS_STMT1 ? DWARF2_FLAG_IS_STMT(1 << 0) : 0; |
| 1060 | fragS *last_frag = NULL((void*)0), *frag; |
| 1061 | addressT last_frag_ofs = 0, frag_ofs; |
| 1062 | symbolS *last_lab = NULL((void*)0), *lab; |
| 1063 | struct line_entry *next; |
| 1064 | |
| 1065 | do |
| 1066 | { |
| 1067 | int line_delta; |
| 1068 | |
| 1069 | if (filenum != e->loc.filenum) |
| 1070 | { |
| 1071 | filenum = e->loc.filenum; |
| 1072 | out_opcode (DW_LNS_set_file); |
| 1073 | out_uleb128 (filenum); |
| 1074 | } |
| 1075 | |
| 1076 | if (column != e->loc.column) |
| 1077 | { |
| 1078 | column = e->loc.column; |
| 1079 | out_opcode (DW_LNS_set_column); |
| 1080 | out_uleb128 (column); |
| 1081 | } |
| 1082 | |
| 1083 | if (isa != e->loc.isa) |
| 1084 | { |
| 1085 | isa = e->loc.isa; |
| 1086 | out_opcode (DW_LNS_set_isa); |
| 1087 | out_uleb128 (isa); |
| 1088 | } |
| 1089 | |
| 1090 | if ((e->loc.flags ^ flags) & DWARF2_FLAG_IS_STMT(1 << 0)) |
| 1091 | { |
| 1092 | flags = e->loc.flags; |
| 1093 | out_opcode (DW_LNS_negate_stmt); |
| 1094 | } |
| 1095 | |
| 1096 | if (e->loc.flags & DWARF2_FLAG_BASIC_BLOCK(1 << 1)) |
| 1097 | out_opcode (DW_LNS_set_basic_block); |
| 1098 | |
| 1099 | if (e->loc.flags & DWARF2_FLAG_PROLOGUE_END(1 << 2)) |
| 1100 | out_opcode (DW_LNS_set_prologue_end); |
| 1101 | |
| 1102 | if (e->loc.flags & DWARF2_FLAG_EPILOGUE_BEGIN(1 << 3)) |
| 1103 | out_opcode (DW_LNS_set_epilogue_begin); |
| 1104 | |
| 1105 | /* Don't try to optimize away redundant entries; gdb wants two |
| 1106 | entries for a function where the code starts on the same line as |
| 1107 | the {, and there's no way to identify that case here. Trust gcc |
| 1108 | to optimize appropriately. */ |
| 1109 | line_delta = e->loc.line - line; |
| 1110 | lab = e->label; |
| 1111 | frag = symbol_get_frag (lab); |
| 1112 | frag_ofs = S_GET_VALUE (lab); |
| 1113 | |
| 1114 | if (last_frag == NULL((void*)0)) |
| 1115 | { |
| 1116 | out_set_addr (lab); |
| 1117 | out_inc_line_addr (line_delta, 0); |
| 1118 | } |
| 1119 | else if (frag == last_frag) |
| 1120 | out_inc_line_addr (line_delta, frag_ofs - last_frag_ofs); |
| 1121 | else |
| 1122 | relax_inc_line_addr (line_delta, lab, last_lab); |
| 1123 | |
| 1124 | line = e->loc.line; |
| 1125 | last_lab = lab; |
| 1126 | last_frag = frag; |
| 1127 | last_frag_ofs = frag_ofs; |
| 1128 | |
| 1129 | next = e->next; |
| 1130 | free (e); |
| 1131 | e = next; |
| 1132 | } |
| 1133 | while (e); |
| 1134 | |
| 1135 | /* Emit a DW_LNE_end_sequence for the end of the section. */ |
| 1136 | frag = last_frag_for_seg (seg); |
| 1137 | frag_ofs = get_frag_fix (frag); |
| 1138 | if (frag == last_frag) |
| 1139 | out_inc_line_addr (INT_MAX2147483647, frag_ofs - last_frag_ofs); |
| 1140 | else |
| 1141 | { |
| 1142 | lab = symbol_temp_new (seg, frag_ofs, frag); |
| 1143 | relax_inc_line_addr (INT_MAX2147483647, lab, last_lab); |
| 1144 | } |
| 1145 | } |
| 1146 | |
| 1147 | /* Emit the directory and file tables for .debug_line. */ |
| 1148 | |
| 1149 | static void |
| 1150 | out_file_list (void) |
| 1151 | { |
| 1152 | size_t size; |
| 1153 | char *cp; |
| 1154 | unsigned int i; |
| 1155 | |
| 1156 | /* Emit directory list. */ |
| 1157 | for (i = 1; i < dirs_in_use; ++i) |
| 1158 | { |
| 1159 | size = strlen (dirs[i]) + 1; |
| 1160 | cp = frag_more (size); |
| 1161 | memcpy (cp, dirs[i], size); |
| 1162 | } |
| 1163 | /* Terminate it. */ |
| 1164 | out_byte ('\0'); |
| 1165 | |
| 1166 | for (i = 1; i < files_in_use; ++i) |
| 1167 | { |
| 1168 | if (files[i].filename == NULL((void*)0)) |
| 1169 | { |
| 1170 | as_bad (_("unassigned file number %ld")("unassigned file number %ld"), (long) i); |
| 1171 | /* Prevent a crash later, particularly for file 1. */ |
| 1172 | files[i].filename = ""; |
| 1173 | continue; |
| 1174 | } |
| 1175 | |
| 1176 | size = strlen (files[i].filename) + 1; |
| 1177 | cp = frag_more (size); |
| 1178 | memcpy (cp, files[i].filename, size); |
| 1179 | |
| 1180 | out_uleb128 (files[i].dir); /* directory number */ |
| 1181 | out_uleb128 (0); /* last modification timestamp */ |
| 1182 | out_uleb128 (0); /* filesize */ |
| 1183 | } |
| 1184 | |
| 1185 | /* Terminate filename list. */ |
| 1186 | out_byte (0); |
| 1187 | } |
| 1188 | |
| 1189 | /* Emit the collected .debug_line data. */ |
| 1190 | |
| 1191 | static void |
| 1192 | out_debug_line (segT line_seg) |
| 1193 | { |
| 1194 | expressionS expr; |
| 1195 | symbolS *line_start; |
| 1196 | symbolS *prologue_end; |
| 1197 | symbolS *line_end; |
| 1198 | struct line_seg *s; |
| 1199 | enum dwarf2_format d2f; |
| 1200 | int sizeof_offset; |
| 1201 | |
| 1202 | subseg_set (line_seg, 0); |
| 1203 | |
| 1204 | line_start = symbol_temp_new_now (); |
| 1205 | prologue_end = symbol_temp_make (); |
| 1206 | line_end = symbol_temp_make (); |
| 1207 | |
| 1208 | /* Total length of the information for this compilation unit. */ |
| 1209 | expr.X_op = O_subtract; |
| 1210 | expr.X_add_symbol = line_end; |
| 1211 | expr.X_op_symbol = line_start; |
| 1212 | |
| 1213 | d2f = DWARF2_FORMAT ()dwarf2_format_32bit; |
| 1214 | if (d2f == dwarf2_format_32bit) |
| 1215 | { |
| 1216 | expr.X_add_number = -4; |
| 1217 | emit_expr (&expr, 4); |
| 1218 | sizeof_offset = 4; |
| 1219 | } |
| 1220 | else if (d2f == dwarf2_format_64bit) |
| 1221 | { |
| 1222 | expr.X_add_number = -12; |
| 1223 | out_four (-1); |
| 1224 | emit_expr (&expr, 8); |
| 1225 | sizeof_offset = 8; |
| 1226 | } |
| 1227 | else if (d2f == dwarf2_format_64bit_irix) |
| 1228 | { |
| 1229 | expr.X_add_number = -8; |
| 1230 | emit_expr (&expr, 8); |
| 1231 | sizeof_offset = 8; |
| 1232 | } |
| 1233 | else |
| 1234 | { |
| 1235 | as_fatal (_("internal error: unknown dwarf2 format")("internal error: unknown dwarf2 format")); |
| 1236 | } |
| 1237 | |
| 1238 | /* Version. */ |
| 1239 | out_two (2); |
| 1240 | |
| 1241 | /* Length of the prologue following this length. */ |
| 1242 | expr.X_op = O_subtract; |
| 1243 | expr.X_add_symbol = prologue_end; |
| 1244 | expr.X_op_symbol = line_start; |
| 1245 | expr.X_add_number = - (4 + 2 + 4); |
| 1246 | emit_expr (&expr, sizeof_offset); |
| 1247 | |
| 1248 | /* Parameters of the state machine. */ |
| 1249 | out_byte (DWARF2_LINE_MIN_INSN_LENGTH1); |
| 1250 | out_byte (DWARF2_LINE_DEFAULT_IS_STMT1); |
| 1251 | out_byte (DWARF2_LINE_BASE-5); |
| 1252 | out_byte (DWARF2_LINE_RANGE14); |
| 1253 | out_byte (DWARF2_LINE_OPCODE_BASE13); |
| 1254 | |
| 1255 | /* Standard opcode lengths. */ |
| 1256 | out_byte (0); /* DW_LNS_copy */ |
| 1257 | out_byte (1); /* DW_LNS_advance_pc */ |
| 1258 | out_byte (1); /* DW_LNS_advance_line */ |
| 1259 | out_byte (1); /* DW_LNS_set_file */ |
| 1260 | out_byte (1); /* DW_LNS_set_column */ |
| 1261 | out_byte (0); /* DW_LNS_negate_stmt */ |
| 1262 | out_byte (0); /* DW_LNS_set_basic_block */ |
| 1263 | out_byte (0); /* DW_LNS_const_add_pc */ |
| 1264 | out_byte (1); /* DW_LNS_fixed_advance_pc */ |
| 1265 | out_byte (0); /* DW_LNS_set_prologue_end */ |
| 1266 | out_byte (0); /* DW_LNS_set_epilogue_begin */ |
| 1267 | out_byte (1); /* DW_LNS_set_isa */ |
| 1268 | |
| 1269 | out_file_list (); |
| 1270 | |
| 1271 | symbol_set_value_now (prologue_end); |
| 1272 | |
| 1273 | /* For each section, emit a statement program. */ |
| 1274 | for (s = all_segs; s; s = s->next) |
| 1275 | process_entries (s->seg, s->head->head); |
| 1276 | |
| 1277 | symbol_set_value_now (line_end); |
| 1278 | } |
| 1279 | |
| 1280 | /* Emit data for .debug_aranges. */ |
| 1281 | |
| 1282 | static void |
| 1283 | out_debug_aranges (segT aranges_seg, segT info_seg) |
| 1284 | { |
| 1285 | unsigned int addr_size = sizeof_address; |
| 1286 | addressT size, skip; |
| 1287 | struct line_seg *s; |
| 1288 | expressionS expr; |
| 1289 | char *p; |
| 1290 | |
| 1291 | size = 4 + 2 + 4 + 1 + 1; |
| 1292 | |
| 1293 | skip = 2 * addr_size - (size & (2 * addr_size - 1)); |
| 1294 | if (skip == 2 * addr_size) |
| 1295 | skip = 0; |
| 1296 | size += skip; |
| 1297 | |
| 1298 | for (s = all_segs; s; s = s->next) |
| 1299 | size += 2 * addr_size; |
| 1300 | |
| 1301 | size += 2 * addr_size; |
| 1302 | |
| 1303 | subseg_set (aranges_seg, 0); |
| 1304 | |
| 1305 | /* Length of the compilation unit. */ |
| 1306 | out_four (size - 4); |
| 1307 | |
| 1308 | /* Version. */ |
| 1309 | out_two (2); |
| 1310 | |
| 1311 | /* Offset to .debug_info. */ |
| 1312 | /* ??? sizeof_offset */ |
| 1313 | TC_DWARF2_EMIT_OFFSETgeneric_dwarf2_emit_offset (section_symbol (info_seg), 4); |
| 1314 | |
| 1315 | /* Size of an address (offset portion). */ |
| 1316 | out_byte (addr_size); |
| 1317 | |
| 1318 | /* Size of a segment descriptor. */ |
| 1319 | out_byte (0); |
| 1320 | |
| 1321 | /* Align the header. */ |
| 1322 | if (skip) |
| 1323 | frag_align (ffs (2 * addr_size) - 1, 0, 0); |
| 1324 | |
| 1325 | for (s = all_segs; s; s = s->next) |
| 1326 | { |
| 1327 | fragS *frag; |
| 1328 | symbolS *beg, *end; |
| 1329 | |
| 1330 | frag = first_frag_for_seg (s->seg); |
| 1331 | beg = symbol_temp_new (s->seg, 0, frag); |
| 1332 | s->text_start = beg; |
| 1333 | |
| 1334 | frag = last_frag_for_seg (s->seg); |
| 1335 | end = symbol_temp_new (s->seg, get_frag_fix (frag), frag); |
| 1336 | s->text_end = end; |
| 1337 | |
| 1338 | expr.X_op = O_symbol; |
| 1339 | expr.X_add_symbol = beg; |
| 1340 | expr.X_add_number = 0; |
| 1341 | emit_expr (&expr, addr_size); |
| 1342 | |
| 1343 | expr.X_op = O_subtract; |
| 1344 | expr.X_add_symbol = end; |
| 1345 | expr.X_op_symbol = beg; |
| 1346 | expr.X_add_number = 0; |
| 1347 | emit_expr (&expr, addr_size); |
| 1348 | } |
| 1349 | |
| 1350 | p = frag_more (2 * addr_size); |
| 1351 | md_number_to_charsnumber_to_chars_littleendian (p, 0, addr_size); |
| 1352 | md_number_to_charsnumber_to_chars_littleendian (p + addr_size, 0, addr_size); |
| 1353 | } |
| 1354 | |
| 1355 | /* Emit data for .debug_abbrev. Note that this must be kept in |
| 1356 | sync with out_debug_info below. */ |
| 1357 | |
| 1358 | static void |
| 1359 | out_debug_abbrev (segT abbrev_seg) |
| 1360 | { |
| 1361 | subseg_set (abbrev_seg, 0); |
| 1362 | |
| 1363 | out_uleb128 (1); |
| 1364 | out_uleb128 (DW_TAG_compile_unit); |
| 1365 | out_byte (DW_CHILDREN_no0x00); |
| 1366 | out_abbrev (DW_AT_stmt_list, DW_FORM_data4); |
| 1367 | if (all_segs->next == NULL((void*)0)) |
| 1368 | { |
| 1369 | out_abbrev (DW_AT_low_pc, DW_FORM_addr); |
| 1370 | out_abbrev (DW_AT_high_pc, DW_FORM_addr); |
| 1371 | } |
| 1372 | out_abbrev (DW_AT_name, DW_FORM_string); |
| 1373 | out_abbrev (DW_AT_comp_dir, DW_FORM_string); |
| 1374 | out_abbrev (DW_AT_producer, DW_FORM_string); |
| 1375 | out_abbrev (DW_AT_language, DW_FORM_data2); |
| 1376 | out_abbrev (0, 0); |
| 1377 | |
| 1378 | /* Terminate the abbreviations for this compilation unit. */ |
| 1379 | out_byte (0); |
| 1380 | } |
| 1381 | |
| 1382 | /* Emit a description of this compilation unit for .debug_info. */ |
| 1383 | |
| 1384 | static void |
| 1385 | out_debug_info (segT info_seg, segT abbrev_seg, segT line_seg) |
| 1386 | { |
| 1387 | char producer[128]; |
| 1388 | char *comp_dir; |
| 1389 | expressionS expr; |
| 1390 | symbolS *info_start; |
| 1391 | symbolS *info_end; |
| 1392 | char *p; |
| 1393 | int len; |
| 1394 | enum dwarf2_format d2f; |
| 1395 | int sizeof_offset; |
| 1396 | |
| 1397 | subseg_set (info_seg, 0); |
| 1398 | |
| 1399 | info_start = symbol_temp_new_now (); |
| 1400 | info_end = symbol_temp_make (); |
| 1401 | |
| 1402 | /* Compilation Unit length. */ |
| 1403 | expr.X_op = O_subtract; |
| 1404 | expr.X_add_symbol = info_end; |
| 1405 | expr.X_op_symbol = info_start; |
| 1406 | |
| 1407 | d2f = DWARF2_FORMAT ()dwarf2_format_32bit; |
| 1408 | if (d2f == dwarf2_format_32bit) |
| 1409 | { |
| 1410 | expr.X_add_number = -4; |
| 1411 | emit_expr (&expr, 4); |
| 1412 | sizeof_offset = 4; |
| 1413 | } |
| 1414 | else if (d2f == dwarf2_format_64bit) |
| 1415 | { |
| 1416 | expr.X_add_number = -12; |
| 1417 | out_four (-1); |
| 1418 | emit_expr (&expr, 8); |
| 1419 | sizeof_offset = 8; |
| 1420 | } |
| 1421 | else if (d2f == dwarf2_format_64bit_irix) |
| 1422 | { |
| 1423 | expr.X_add_number = -8; |
| 1424 | emit_expr (&expr, 8); |
| 1425 | sizeof_offset = 8; |
| 1426 | } |
| 1427 | else |
| 1428 | { |
| 1429 | as_fatal (_("internal error: unknown dwarf2 format")("internal error: unknown dwarf2 format")); |
| 1430 | } |
| 1431 | |
| 1432 | /* DWARF version. */ |
| 1433 | out_two (2); |
| 1434 | |
| 1435 | /* .debug_abbrev offset */ |
| 1436 | TC_DWARF2_EMIT_OFFSETgeneric_dwarf2_emit_offset (section_symbol (abbrev_seg), sizeof_offset); |
| 1437 | |
| 1438 | /* Target address size. */ |
| 1439 | out_byte (sizeof_address); |
| 1440 | |
| 1441 | /* DW_TAG_compile_unit DIE abbrev */ |
| 1442 | out_uleb128 (1); |
| 1443 | |
| 1444 | /* DW_AT_stmt_list */ |
| 1445 | /* ??? sizeof_offset */ |
| 1446 | TC_DWARF2_EMIT_OFFSETgeneric_dwarf2_emit_offset (section_symbol (line_seg), 4); |
| 1447 | |
| 1448 | /* These two attributes may only be emitted if all of the code is |
| 1449 | contiguous. Multiple sections are not that. */ |
| 1450 | if (all_segs->next == NULL((void*)0)) |
| 1451 | { |
| 1452 | /* DW_AT_low_pc */ |
| 1453 | expr.X_op = O_symbol; |
| 1454 | expr.X_add_symbol = all_segs->text_start; |
| 1455 | expr.X_add_number = 0; |
| 1456 | emit_expr (&expr, sizeof_address); |
| 1457 | |
| 1458 | /* DW_AT_high_pc */ |
| 1459 | expr.X_op = O_symbol; |
| 1460 | expr.X_add_symbol = all_segs->text_end; |
| 1461 | expr.X_add_number = 0; |
| 1462 | emit_expr (&expr, sizeof_address); |
| 1463 | } |
| 1464 | |
| 1465 | /* DW_AT_name. We don't have the actual file name that was present |
| 1466 | on the command line, so assume files[1] is the main input file. |
| 1467 | We're not supposed to get called unless at least one line number |
| 1468 | entry was emitted, so this should always be defined. */ |
| 1469 | if (!files || files_in_use < 1) |
| 1470 | abort ()as_abort ("/usr/src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c" , 1470, __PRETTY_FUNCTION__); |
| 1471 | if (files[1].dir) |
| 1472 | { |
| 1473 | len = strlen (dirs[files[1].dir]); |
| 1474 | p = frag_more (len + 1); |
| 1475 | memcpy (p, dirs[files[1].dir], len); |
| 1476 | p[len] = '/'; |
| 1477 | } |
| 1478 | len = strlen (files[1].filename) + 1; |
| 1479 | p = frag_more (len); |
| 1480 | memcpy (p, files[1].filename, len); |
| 1481 | |
| 1482 | /* DW_AT_comp_dir */ |
| 1483 | comp_dir = getpwd (); |
| 1484 | len = strlen (comp_dir) + 1; |
| 1485 | p = frag_more (len); |
| 1486 | memcpy (p, comp_dir, len); |
| 1487 | |
| 1488 | /* DW_AT_producer */ |
| 1489 | sprintf (producer, "GNU AS %s", VERSION"2.17"); |
| 1490 | len = strlen (producer) + 1; |
| 1491 | p = frag_more (len); |
| 1492 | memcpy (p, producer, len); |
| 1493 | |
| 1494 | /* DW_AT_language. Yes, this is probably not really MIPS, but the |
| 1495 | dwarf2 draft has no standard code for assembler. */ |
| 1496 | out_two (DW_LANG_Mips_Assembler); |
| 1497 | |
| 1498 | symbol_set_value_now (info_end); |
| 1499 | } |
| 1500 | |
| 1501 | /* Finish the dwarf2 debug sections. We emit .debug.line if there |
| 1502 | were any .file/.loc directives, or --gdwarf2 was given, or if the |
| 1503 | file has a non-empty .debug_info section. If we emit .debug_line, |
| 1504 | and the .debug_info section is empty, we also emit .debug_info, |
| 1505 | .debug_aranges and .debug_abbrev. ALL_SEGS will be non-null if |
| 1506 | there were any .file/.loc directives, or --gdwarf2 was given and |
| 1507 | there were any located instructions emitted. */ |
| 1508 | |
| 1509 | void |
| 1510 | dwarf2_finish (void) |
| 1511 | { |
| 1512 | segT line_seg; |
| 1513 | struct line_seg *s; |
| 1514 | segT info_seg; |
| 1515 | int emit_other_sections = 0; |
| 1516 | |
| 1517 | info_seg = bfd_get_section_by_name (stdoutput, ".debug_info"); |
| 1518 | emit_other_sections = info_seg == NULL((void*)0) || !seg_not_empty_p (info_seg); |
| 1519 | |
| 1520 | if (!all_segs && emit_other_sections) |
| 1521 | /* There is no line information and no non-empty .debug_info |
| 1522 | section. */ |
| 1523 | return; |
| 1524 | |
| 1525 | /* Calculate the size of an address for the target machine. */ |
| 1526 | sizeof_address = DWARF2_ADDR_SIZE (stdoutput)(bfd_arch_bits_per_address (stdoutput) / 8); |
| 1527 | |
| 1528 | /* Create and switch to the line number section. */ |
| 1529 | line_seg = subseg_new (".debug_line", 0); |
| 1530 | bfd_set_section_flags (stdoutput, line_seg, SEC_READONLY0x008 | SEC_DEBUGGING0x2000); |
| 1531 | |
| 1532 | /* For each subsection, chain the debug entries together. */ |
| 1533 | for (s = all_segs; s; s = s->next) |
| 1534 | { |
| 1535 | struct line_subseg *ss = s->head; |
| 1536 | struct line_entry **ptail = ss->ptail; |
| 1537 | |
| 1538 | while ((ss = ss->next) != NULL((void*)0)) |
| 1539 | { |
| 1540 | *ptail = ss->head; |
| 1541 | ptail = ss->ptail; |
| 1542 | } |
| 1543 | } |
| 1544 | |
| 1545 | out_debug_line (line_seg); |
| 1546 | |
| 1547 | /* If this is assembler generated line info, and there is no |
| 1548 | debug_info already, we need .debug_info and .debug_abbrev |
| 1549 | sections as well. */ |
| 1550 | if (emit_other_sections) |
| 1551 | { |
| 1552 | segT abbrev_seg; |
| 1553 | segT aranges_seg; |
| 1554 | |
| 1555 | assert (all_segs)((void) ((all_segs) ? 0 : (as_assert ("/usr/src/gnu/usr.bin/binutils-2.17/gas/dwarf2dbg.c" , 1555, __PRETTY_FUNCTION__), 0))); |
| 1556 | |
| 1557 | info_seg = subseg_new (".debug_info", 0); |
| 1558 | abbrev_seg = subseg_new (".debug_abbrev", 0); |
| 1559 | aranges_seg = subseg_new (".debug_aranges", 0); |
| 1560 | |
| 1561 | bfd_set_section_flags (stdoutput, info_seg, |
| 1562 | SEC_READONLY0x008 | SEC_DEBUGGING0x2000); |
| 1563 | bfd_set_section_flags (stdoutput, abbrev_seg, |
| 1564 | SEC_READONLY0x008 | SEC_DEBUGGING0x2000); |
| 1565 | bfd_set_section_flags (stdoutput, aranges_seg, |
| 1566 | SEC_READONLY0x008 | SEC_DEBUGGING0x2000); |
| 1567 | |
| 1568 | record_alignment (aranges_seg, ffs (2 * sizeof_address) - 1); |
| 1569 | |
| 1570 | out_debug_aranges (aranges_seg, info_seg); |
| 1571 | out_debug_abbrev (abbrev_seg); |
| 1572 | out_debug_info (info_seg, abbrev_seg, line_seg); |
| 1573 | } |
| 1574 | } |